TITLE:   GCN CIRCULAR
NUMBER:  37304
SUBJECT: GRB 240825A: KAIT optical observations
DATE:    24/08/26 17:49:29 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on

behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, responded to GRB 240825A (Gupta et al., GCN 37274;

Fermi GBM team, GCN 37273) starting at 05:36 UT, Aug. 26th, about

13.73 hours after the bust. Observations were performed in the clear

(roughly R) filter, and the exposure time was 60s per image, with a

total of 31 images were obtained. We clearly detected the optical

afterglow (Gupta et al., GCN 37274; Jiang et al., GCN 37275; Dutton

et al., GCN 37276; Odeh et al., GCN 37277, Zhang et al., GCN 37278;

Li et al., GCN 37280, Izzo et al., GCN 37287; Lipunov et al., GCN

37289; Leonini et al., GCN 37291; Wu et al., GCN 37292; Martin-Carrillo

et al., GCN 37293; Brivio et al., GCN 37295; Kuin et al., GCN 37296;

Odeh et al., GCN 37299; Le Floc’h et al., GCN 37300; Guiffreda et al.,

GCN 37303) in our coadd image, which we measured its brightness of

20.8 +/- 0.2 mag at a mid time of ~14.04 hours after the burst,

calibrated to the Pan-STARRS1 catalog.